Mid-trial design reviews for sequential clinical trialsJohn Whitehead, M. R. Sooriyarachchi, Anne Whitehead et al.|Statistics in Medicine|2001Cited by 52
Sample size review in a head injury trial with ordered categorical responsesKim Bolland, John Whitehead, M. R. Sooriyarachchi|Statistics in Medicine|1998Cited by 45
A Method for Sequential Analysis of Survival Data with Nonproportional HazardsM. R. Sooriyarachchi, John Whitehead|Biometrics|1998Cited by 18
Incorporating Data Received after a Sequential Trial Has Stopped into the Final Analysis: Implementation and Comparison of MethodsM. R. Sooriyarachchi, Anne Whitehead, John Whitehead et al.|Biometrics|2003Cited by 16
Incorporating intermediate binary responses into interim analyses of clinical trials: A comparison of four methodsAnne Whitehead, Kim Bolland, M. R. Sooriyarachchi et al.|Statistics in Medicine|2007Cited by 10